Date of download: 11/7/2017 Copyright © ASME. All rights reserved. From: Experimental and Numerical Heat Transfer Analysis of an Air-Based Cavity-Receiver for Solar Trough Concentrators J. Sol. Energy Eng. 2012;134(2):021002-021002-8. doi:10.1115/1.4005447 Figure Legend: Energy breakdown of heat losses by the receiver (gray areas) and heat gain by the HTF (white area), and the associated HTF pumping power requirement (black curve), normalized by the solar power incident from the primary concentrator, Q·solar, as functions of the HTF outlet temperature THTF,out in the range 250–450 °C for the spring equinox (a) and the summer solstice (b) at solar noon; THTF,in=120 °C